Role of vertical winds on the Rayleigh-Taylor mode instabilites of the night-time equatorial ionosphere

Details Role of vertical winds on the Rayleigh-Taylor mode instabilites of the night-time equatorial ionosphere Role of vertical winds on the Rayleigh-Taylor mode instabilites of the night-time equatorial ionosphere

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49..981s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, Oct. 1987, p. 981-985. Research supported by the Depar

Physics

35

Atmospheric Circulation, Equatorial Atmosphere, Ionospheric Disturbances, Night Sky, Taylor Instability, Vertical Air Currents, F Region, Space Plasmas, Winds Aloft

Scientific paper

In view of the recent observations of vertical winds in the equatorial ionosphere in the evening and night, the role of vertical winds in the Rayleigh-Taylor (R-T) mode instability has been reexamined. The mathematical treatment of Chiu and Straus (1979) for horizontal winds is extended to evaluate the role of vertical winds in causing the R-T mode instability. It is shown that the vertical (downward) winds of small magnitude have a very significant effect on the instability growth rate in the F-region. A downward wind of 1 m/s can cause the same growth rate as a 200-m/s eastward wind at 260 km altitude. Furthermore, a downward wind of 16 m/s at 300 km can be as effective as that due to the gravitational drift itself. Similarly, an upward wind can inhibit the instability on the bottomside of the F-region. It appears that the polarity of the vertical winds (upward or downward) at the base of the F-layer plays an important role in the growth of the R-T mode plasma instability in the equatorial ionosphere.

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